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Design thinking has an important role in STEM education. However, there has been limited research on how students engage in various modalities throughout the design process in hands-on design tasks. To promote middle school students’ engineering literacy, it is necessary to examine the use of design modalities during design. Using a case study approach, we examine middle school students’ design stages and modalities during design activities. We also identify the patterns of design processes in the teams with different design outcomes. Drawing on theories in design thinking and embodied interaction, we proposed a framework and devised a video analysis protocol to examine students’ design stages and modalities. Middle school students attending a design workshop engaged in two design activities in teams of 3–4 people. The design sessions were video recorded and analyzed using the video analysis protocol. The teams engaged in the stages of planning, building, and testing, while employing the verbal, the visual, and the physical modalities. The teams that varied in design outcomes exhibited different patterns in the use of multiple modalities during the design stages. This study contributes to research on design thinking by proposing a framework for analyzing middle school students’ multimodal design processes and presenting data visualization methods to identify patterns in design stages and modalities. The findings suggest the necessity to examine students’ use of design modalities in the context of design stages and imply the potential benefits of using multiple modalities during design. The implications for future research and education practices are also discussed. 

Effective and equitable CS teaching in classrooms is contingent on teachers' high-levels of self-efficacy in CS as well as a robust understanding of equity issues in CS classrooms. To this end, our study examined the influence of a professional development (PD) course, Teaching Exploring Computer Science (TECS), on promoting teacher self-efficacy and equity awareness in CS education. This nine-week PD was offered in a hybrid format, delivering on-line and face-to-face classes to high school teachers across various disciplines who served under-represented students. The participants completed a selfefficacy survey focusing on their ability to teach ECS, both before and after the course. Results showed that teachers' selfefficacy in the content knowledge and pedagogical knowledge of ECS significantly increased as a result of taking the course. We also evaluated teacher's understanding of the equity issues by conducting a content analysis of their reflection essays written at the end of the course. Four major themes emerged from the content analysis, highlighting the impact of equitable practices on CS participation. This research demonstrates the role of a professional development course in promoting teachers' self-efficacy beliefs in teaching CS and their understanding of the equity issues and presents tools for assessing teachers' development in these areas.